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Why Document Redaction Alone Fails to Protect PDF Privacy
When lawyers, journalists, or corporate teams redact text in PDF files, document properties remain buried inside the PDF Info dictionary and embedded XMP stream. Leaked author usernames and internal file paths routinely expose whistleblowers and privileged sources.
Standard PDF viewers only show the basic Info dictionary in document properties. But modern PDF creation software (Adobe Acrobat, macOS Pages, Microsoft Word) embeds an Extensible Metadata Platform (XMP) XML packet containing historical creator identifiers.
Graphic design tools like Adobe Illustrator and InDesign insert private `/PieceInfo` dictionaries that record previous session IDs, internal workstation names, and project file paths. Our scrubber clears `/PieceInfo` across the entire document catalog.
Commercial services like Smallpdf and Adobe Acrobat Online force users to upload sensitive contracts and internal reports to their cloud servers. OverlayCheck processes all byte buffers locally inside browser RAM using `pdf-lib`.